Hi, i want to thank this thread for the info about the json file format. i'm trying to make a GUI for this and been using it on my kindle. i've posted it on my blog if anyone is interested (mickeymickstechblog.blogspot.com).
umm, but it is for Windows only. and i haven't tested/tried it on any other kindle.
note: sorry for plugging in my blog. the admin can delete it, but pls do leave the "thank u" part. hehe

happy reading!

Have you looked into this thread at mobileread? Firmware Update Kindle Collection Manager for Windows, url hopefully below:

The developer is up to collections editor v.4 and working on v.5. As someone with over 2500 files loaded on the kindle, I've found his program very useful. It's still not without flaws but he is working on them and improvements with each release.

I downloaded your editor but probably won't have a chance to try it until a few days from now, depending on work schedule.